Any special steps to install Tiny7 via BootCamp?

I've done a few flawless Windows 7 installs but I'm just having a hard time getting Tiny7 to install correctly.

The issue I'm currently running into is after I've used BootCamp Utility to make a bootable thumbdrive from the Tiny7 iso on my computer. That stage works just fine. However, after I quit BootCamp Utility and re-open it to actually install Windows, I'm asked to insert the bootable disk. The disk is still in the USB port and regognized just fine in Finder...

I've tried using a different USB port, tried a different thumbdrive that has always worked, and even restarted my computer.

Right now I'm waiting for a fresh copy of Tiny7 to download so I can use that; I'd been using one from a friend and nearly everything I've gotten from him has been... shady, to say the least. But, considering that BootCamp Utility unpacked it to the thumbdrive just fine, I doubt it's an issue with the file itself.

Does anyone have experience with this? I'm on (theoretically) the latest version of everything; I searched around but couldn't seem to find anyone having similar issues.

Could it just be that Tiny7 doesn't 'work' with BootCamp? Do I need to make a normal Windows 7 thumb drive and a Tiny7 drive and just swap them out after partitioning and rebooting? I think that will be my next step. As mentioned I'm currently waiting for the iso to finish downloading so I can try it, but in the meantime, any help would be massively appreciated.